LTC6401-14
5
640114f
AC ELECTRICAL CHARACTERISTICS
TYPICAL PERFORMANCE CHARACTERISTICS
Frequency Response Gain 0.1dB Flatness
S21 Phase and Group Delay vs
Frequency
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
140MHz Input Signal
HD2,140M/
HD3,140M
Second/Third Order Harmonic Distortion V
OUT
= 2V
P-P
, R
L
= 200Ω –79/–57 dBc
V
OUT
= 2V
P-P
, No R
L
–87/–69 dBc
IMD3,140M Third-Order Intermodulation
(f1 = 139.5MHz f2 = 140.5MHz)
V
OUT
= 2V
P-P
Composite, R
L
= 200Ω –70 dBc
V
OUT
= 2V
P-P
Composite, No R
L
–81 dBc
OIP3,140M Equivalent Third-Order Output Intercept
Point (f1 = 139.5MHz f2 = 140.5MHz)
V
OUT
= 2V
P-P
Composite, No R
L
(Note 7) 44.5 dBm
P1dB,140M 1dB Compression Point R
L
= 375Ω (Notes 5, 7) 17.7 dBm
NF140M Noise Figure R
L
= 375Ω (Note 5) 7.4 dB
e
IN,140M
Input Referred Voltage Noise Density Includes Resistors (Short Inputs) 2.5 nV/√
⎯
H
⎯
z
e
ON,140M
Output Referred Voltage Noise Density Includes Resistors (Short Inputs) 12.5 nV/√
⎯
H
⎯
z
IMD3,130M/150M Third-Order Intermodulation
(f1 = 130MHz f2 = 150MHz) Measure at
170MHz
V
OUT
= 2V
P-P
Composite, R
L
= 375Ω –70 –61 dBc
Specifi cations are at T
A
= 25°C. V
+
= 3V, V
–
= 0V, V
OCM
= 1.25V,
⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E = 0V, No R
L
unless otherwise noted.
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Input pins (+IN, –IN) are protected by steering diodes to either
supply. If the inputs go beyond either supply rail, the input current should
be limited to less than 10mA.
Note 3: The LTC6401C and LTC6401I are guaranteed functional over the
operating temperature range of –40°C to 85°C.
Note 4: The LTC6401C is guaranteed to meet specifi ed performance from
0°C to 70°C. It is designed, characterized and expected to meet specifi ed
performance from –40°C to 85°C but is not tested or QA sampled at these
temperatures. The LTC6401I is guaranteed to meet specifi ed performance
from –40°C to 85°C.
Note 5: Input and output baluns used. See Test Circuit A.
Note 6: Measured using Test Circuit B. R
L
= 87.5Ω per output.
Note 7: Since the LTC6401-14 is a feedback amplifi er with low output
impedance, a resistive load is not required when driving an AD converter.
Therefore, typical output power is very small. In order to compare the
LTC6401-14 with amplifi ers that require 50Ω output load, the LTC6401-14
output voltage swing driving a given R
L
is converted to OIP3 and P
1dB
as
if it were driving a 50Ω load. Using this modifi ed convention, 2V
P-P
is by
defi nition equal to 10dBm, regardless of actual R
L
.
FREQUENCY (MHz)
0
PHASE (DEGREE)
0
–50
–100
–150
–200
GROUP DELAY (ns)
0.8
0.6
0.4
0.2
0
200 400 600 800
1000
640114 G03
PHASE
GROUP DELAY
TEST CIRCUIT B
FREQUENCY (MHz)
10 100 1000 3000
GAIN (dB)
20
18
16
14
10
8
6
4
2
0
12
640114 G01
TEST CIRCUIT B
FREQUENCY (MHz)
10 100 1000 3000
GAIN FLATNESS (dB)
1.0
0.8
–0.8
0.6
–0.6
0.4
–0.4
0.2
–0.2
0
–1.0
640114 G02
